Overheating

My car started overheating the pop up appeared something about coolant and the temperature needle was going all the way to the H. I was able to get home and eventually put antifreeze and it was okay. Now 2 weeks later the temperature needle started going to the H but back down. Checked the coolant there was still some in there. So I took it to the mechanic said it is the fans not cooling the motor down and the fuse box is bad and needs new fuses. But I was talking to a friend and they said it can't be the fans and the fuses should be one or the other. Please help! PS: my car had been stalling on me sometimes when I stop somewhere real quick and I get back in and start the car but it will stall n shut off. The mechanic said that once the fans are fixed everything should run smooth. I don’t really know. Some one please shed some light.